What does comma do while using cin in c++

Question

I was practicing practicing some programming and by mistake wrote the following line of code :

int a,b;
cin>>a,b;

Can anybody explain what the comma does here and why doesn't the compiler show any error.

Comma operator: https://en.cppreference.com/w/cpp/language/operator_other — Shawn, Jan 06 '19 at 13:46

score 1 · Answer 1 · answered Jan 06 '19 at 13:47

1

It means that the whole expression has the value b.

But because b is not initialised the behaviour of your code is undefined!

Modern compilers can warm you of this.

answered Jan 06 '19 at 13:47

Bathsheba

1 Answers1